I need to replace a Sram attack shifter. All searches for this product refer to the shifter as either a "shorty" or as having a small "AMY" grip. This is what I presently have, but due to hand size and arthritis I believe I might be better of with a larger grip. Is there a larger grip available on the SRAM Atack shifter? What is it called so I could do a search? Or maybe someone knows of a source?